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The results of tests made on a novel coupler design suitable for MIC's are described. The design utilizes resistive termination of fields above the dielectric. Directivity of 14 dB was achieved with a /spl lambda//16 coupler at 3.6 GHz. Uses for this design technique are signal sampling where very flat coupling is not required.
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Robert Weirather (1974) studied this question.
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